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Stories by David Appell

Dark Forces at Work

Ten years ago two teams discovered that the universe will expand forever at an ever faster rate, thanks to an unseen energy. The leader of one of the groups, Saul Perlmutter, expects that new observations will soon illuminate the universe's dark side...

April 23, 2008 — David Appell

Behind the Hockey Stick

Seven years ago Michael Mann introduced a graph that became an iconic symbol of humanity's contribution to global warming. He has been defending his science ever since

February 21, 2005 — David Appell

Father of Spirit and Opportunity

With the success of twin rovers on the Red Planet, Steven W. Squyres and his team are showing how to conduct robotic missions--and setting the stage for human exploration

September 27, 2004 — David Appell
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Deep Dives in Science -- Subscribe to our Collector's Editions Today

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